ISO 28199-1:2021 塗料とワニス—スプレー塗布プロセスに関連するコーティングシステムの特性の評価—パート1：用語, 語彙とテストパネルの準備 | ページ 6

3.1

bubble

closed or already burst blister in a layer, arising when solvents or cleavage products evaporate from chemical crosslinking

Note 1 to entry: If bubbles are caused by the process control, the formulation components or both, the viscosity of the paint film has increased too rapidly during the drying phase so that solvents or reaction products still in the paint film have built up at the polymer paint skin which forms, usually resulting in closed blisters and sometimes resulting in burst blisters. Discontinuities can be identified in more detail using a cross-section.

3.2

colour stability

non-variability, or variability within agreed tolerances, of colour despite variation of influencing factors

Note 1 to entry: Examples of influencing factors are thickness and application method.

3.3

measurement pattern

distance between individual measurements on the test panel in the dx and dy directions

3.4

mottling

non-uniform appearance of a film caused by the presence of irregularly shaped, randomly distributed areas on the surface that vary in colour and/or gloss

[SOURCE: ISO 4618:2014, 2.160]

3.5

overspray absorption

ability of a coating material already applied to absorb overspray particles of the same coating material resulting from a subsequent application

Note 1 to entry: Evidence of poor overspray absorption is shown, for example, by raised surface texture (3.12) and low colour stability (3.2) as well as mottling (3.4) .

3.6

pinholing

presence of small holes in a film or coating resembling those made by a pin

Note 1 to entry: Pinholes can be caused by gas inclusions in the base coat that reveal a discontinuity after the application of the clear coating material. They are often the result of inappropriate process parameters. Pinholes are similar to craters and bubbles (3.1) . Discontinuities can be identified in more detail using a cross-section.

[SOURCE: ISO 4618:2014, 2.195, modified — Note 1 to entry added.]

3.7

process hiding power

minimum thickness above which the complete coating system in combination with the colour of the complete substrate achieves colour stability (3.2) or the colour location achieves a value agreed by the interested parties

Note 1 to entry: See also “hiding power”, defined in ISO 4618:2014, 2.138, as “ability of a coating material or a coating to obliterate the colour or the differences in colour of a substrate”.

3.8

redissolving

mutual effects between an already applied coating material and a subsequently applied coating material where components of the subsequently applied coating interact with the already applied coating

Note 1 to entry: The interaction can be recognizable by a change in colour, for example.

3.9

sagging

downward movement of a coating material during application and/or drying or curing in a vertical or an inclined position that results in irregularities in the dry coat

[SOURCE: ISO 4618:2014, 2.221, modified —"or curing" added in the definition.]

3.10

static spray pattern

distribution of the coating material after spray application using defined parameters, with both coated object and spray application system at rest

3.11

dynamic spray pattern

distribution of the coating material after spray application using defined parameters, with coated object and spray application system in relative motion

3.12

surface texture

visual appearance and visible recognisability of structures in the coating surface

3.13

wetting

complete coverage of a substrate when a coating material forms a continuous film on a substrate